Back in March, we looked at a discussion
and Python Enhancement Proposal (PEP) for a new dictionary “addition”
operator for
Python. The discussion back then was lively and voluminous, but the PEP needed some
updates and enhancements in order to proceed. That work has now been done
and a post
about the revised
PEP to the python-ideas mailing list has set off another mega-thread.

Source: LWN.net – [$] The return of Python dictionary “addition”